Pickering foams and parameters influencing their characteristics

Amani, Pouria; Miller, R.; Javadi, Aliyar; Firouzi, Mahshid

doi:10.1016/j.cis.2022.102606

Cited by 63 publications

(30 citation statements)

References 224 publications

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“…The knowledge of interfacial dynamic properties of surfactant-adsorbed layers in the presence of inorganic electrolytes is essential for many industries dealing with foaming, emulsification and coating, such as pharmaceuticals [1], mining [2][3][4], environmental remediation [5,6], food [7,8] and biology [9,10], enhanced oil recovery [11] and gas well deliquification [12][13][14][15]. The stability of foam/emulsion is strongly influenced by surface properties of gas-fluid interfaces containing adsorbed surface-active compounds such as surfactants.…”

Section: Introductionmentioning

confidence: 99%

Effect of Divalent and Monovalent Salts on Interfacial Dilational Rheology of Sodium Dodecylbenzene Sulfonate Solutions

Amani

Firouzi

2022

Colloids and Interfaces

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This study presents the equilibrium surface tension (ST), critical micelle concentration (CMC) and the dilational viscoelasticity of sodium dodecylbenzene sulfonate (SDBS)-adsorbed layers in the presence of NaCl, KCl, LiCl, CaCl2 and MgCl2 at 0.001–0.1 M salt concentration. The ST and surface dilational viscoelasticity were determined using bubble-shape analysis technique. To capture the complete profile of dilational viscoelastic properties of SDBS-adsorbed layers, experiments were conducted within a wide range of SDBS concentrations at a fixed oscillating frequency of 0.01 Hz. Salts were found to lower the ST and induce micellar formation at all concentrations. However, the addition of salts increased dilational viscoelastic modulus only at a certain range of SDBS concentration (below 0.01–0.02 mM SDBS). Above this concentration range, salts decreased dilational viscoelasticity due to the domination of the induced molecular exchange dampening the ST gradient. The dilational viscoelasticity of the salts of interest were in the order CaCl2 > MgCl2 > KCl > NaCl > LiCl. The charge density of ions was found as the corresponding factor for the higher impact of divalent ions compared to monovalent ions, while the impact of monovalent ions was assigned to the degree of matching in water affinities, and thereby the tendency for ion-pairing between SDBS head groups and monovalent ions.

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Section: Introductionmentioning

confidence: 99%

Effect of Divalent and Monovalent Salts on Interfacial Dilational Rheology of Sodium Dodecylbenzene Sulfonate Solutions

Amani

Firouzi

2022

Colloids and Interfaces

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“…The presence of solid precipitates, gels, or even droplets of coacervates has an impact on the formation and stability of foams; for example, those soft particles can clog the Plateau border channels, effectively reducing the foam permeability constant ( K in eq 1), stopping or slowing down the drainage velocity, and helping to increase the stability of foams. , They can also produce the opposite effect on foam stability, destabilizing the liquid films: some PS particles, particularly if they are hydrophobic, can help to break the films between bubbles by the bridging effect. ,, …”

Section: Polymer/surfactant Complexes At Equilibrium In Bulk At Inter...mentioning

confidence: 99%

Polyelectrolyte/Surfactant Mixtures: A Pathway to Smart Foams

Ritacco

2022

ACS Omega

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This review deals with liquid foams stabilized by polyelectrolyte/surfactant (PS) complexes in aqueous solution. It briefly reviews all the important aspects of foam physics at several scales, from interfaces to macroscopic foams, needed to understand the basics of these complex systems, focusing on those particular aspects of foams stabilized by PS mixtures. The final section includes a few examples of smart foams based on PS complexes that have been reported recently in the literature. These PS complexes open an opportunity to develop new intelligent dispersed materials with potential in many fields, such as oil industry, environmental remediation, and pharmaceutical industry, among others. However, there is much work to be done to understand the mechanism involved in the stabilization of foams with PS complexes. Understanding those underlying mechanisms is vital to successfully formulate smart systems. This review is written in the hope of stimulating further work in the physics of PS foams and, particularly, in the search for responsive foams based on polymer-surfactant mixtures.

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“…Foams are a dispersion of an insoluble gas in a liquid or solid, which has the excellent properties of light mass, large specific surface area and high mobility [1,2]. Therefore, foams are used in numerous industrial processes, such as oil recovery, mineral flotation, cosmetics, fire-fighting and chemical decontamination [3][4][5][6]. As we all know, foams are sub-stable systems where the dispersed gas is wrapped in a liquid film.…”

Section: Introductionmentioning

confidence: 99%

CO2-Responsive Smart Foams Stabilized by an Extremely Rigid Bio-Based Surfactant

Tang¹,

Feng²,

Lin³

et al. 2023

Journal of Renewable Materials

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Environment friendly and intelligent surfactants have attracted great attention in recent years. A bio-based CO 2 responsive surfactant rosin acid dimaleimide choline (R-BMI-C) with an extremely rigid skeleton was prepared using rosin and choline as raw materials by Diels-Alder addition reaction and acid-base neutralization reactions. Its structure was confirmed by IR and 1 H NMR spectra. The foams' properties of R-BMI-C could be adjusted by bubbling CO 2 /N 2 to change the structure of the surfactant. At pH 10.4, R-BMI-C forms an unstable foam with a half-life of 1.5 h. When the pH was reduced to 7.4 by bubbling CO 2 , R-BMI-C forms an extremely stable foam with a half-life of 336 h. The surfactant R-BMI-C changed from bola type to conventional type when bubbling CO 2 . And the internal aggregation structure of R-BMI-C aqueous solution changed from spherical micelles to laminar micelles according to the cryogenic-transmission electron microscope. We know that the lamellar structure tends to adsorb at the air/water interface or is trapped in the foam film, which slows down the foam coarsening and agglomeration process, resulting in a significant increase in foam stability. R-BMI-C could be used in oil extraction, fire-fighting and chemical decontamination due to its excellent foaming, stabilization and defoaming properties.

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Pickering foams and parameters influencing their characteristics

Cited by 63 publications

References 224 publications

Effect of Divalent and Monovalent Salts on Interfacial Dilational Rheology of Sodium Dodecylbenzene Sulfonate Solutions

Effect of Divalent and Monovalent Salts on Interfacial Dilational Rheology of Sodium Dodecylbenzene Sulfonate Solutions

Polyelectrolyte/Surfactant Mixtures: A Pathway to Smart Foams

CO2-Responsive Smart Foams Stabilized by an Extremely Rigid Bio-Based Surfactant

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